Chapter

Signal Processing

Robert M. Stern, William J. Ray and Karen S. Quigley

in Psychophysiological Recording

Second edition

Published in print December 2000 | ISBN: 9780195113594
Published online March 2012 | e-ISBN: 9780199846962 | DOI: http://dx.doi.org/10.1093/acprof:oso/9780195113594.003.0014
Signal Processing

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When considering attentional abilities, two physiological variables need to be recorded: basal (tonic) activity or event-related (phasic) activity. In general, tonic activity can be derived from the ongoing level of activity in the system when the organism is at rest. The length of time needed to assess tonic level appropriately will differ across physiological systems, but in many cases it will be on the order of several minutes. Phasic responses typically are measured over time periods that capture the full response from basal level until the physiological parameter returns to its basal level. Decisions about how to assess changes in physiology are somewhat more difficult than those for assessing tonic levels of activity. This chapter discusses several methods used for assessing change and some of the advantages and disadvantages associated with each measure. The use of Fourier analysis or fast Fourier transform, wavelet analysis, and nonlinear dynamical systems analysis for assessing global aspects of physiological signals are also considered.

Keywords: physiological signals; tonic activity; phasic responses; physiology; fast Fourier transform; wavelet analysis; nonlinear dynamical systems analysis

Chapter.  6928 words.  Illustrated.

Subjects: Psychology

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